The high solubility of calcium oxide makes it difficult to produce phosphate-based cements. This website uses cookies to ensure you get the best experience on our websites. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner. For the evaluation of this endpoint, data from one guideline compliant study (EU A.6 method) was used as key information. The water solubility of calcium carbonate, as determined in a study performed according to OECD TG The water solubility of the test item and /or degradation products has been determined to be 956 mg calcium/l of solution at 20.0 ± 0.5 °C (recalculated value for calcium oxide: 1337.6 mg/l). It is almost insoluble in water. In the aquatic environment and in soil, exposure to calcium oxide actually comes down to exposure to calcium and hydroxyl ions. Water solubility of calcium oxide: 1337.6 mg/l at 20 ± 0.5 C (study results, EU A.6 method, recalculated value from calcium). [2] There will be no intake of calcium oxide as such Use of this information is subject to copyright laws and may require the permission of the owner of the information, as described in the ECHA Legal Notice. When heating calcium hydroxide to 512 °C the calcium hydroxide decomposes into calcium oxide and water: Ca(OH) 2 CaO + H 2 O Ca(OH) 2 is only slightly soluble in water (0.16g Ca(OH) 2 /100g water at 20°C) forming a basic solution called lime water . The content is subject to change without prior notice.Reproduction or further distribution of this information may be subject to copyright protection. Please upgrade your Internet Explorer to a newer version. This information has not been reviewed or verified by the Agency or any other authority. number 1305-78-8 Chemical formula CaO Formula weight 56.08 Assay Not less than 95.0% after ignition DESCRIPTION Odourless, hard, white or greyish white masses or granules, or white to greyish white powder FUNCTIONAL USES Alkali, dough conditioner, yeast food CHARACTERISTICS IDENTIFICATION Solubility (Vol. This is the water solubility of calcium. When mixed with water it forms slaked lime (which is actually Ca(OH)2) better known to families as Lime Water (for infant Colic). The solubility of calcium oxide was recalculated from the water solubility value of calcium, which was stated in the study report. Calcium oxide reacts with water to form calcium hydroxide (Ca(OH)2) with the evolution of significant amounts of heat. CaO is one of the most favorable heterogeneous base catalysts due to their relatively high basic sites, nontoxic, low solubility in methanol and can be prepared from cheap resources like lime stone and calcium hydroxide. From: Biofuels, 2011. The water solubility of CaO was not stated in the study report. The water solubility of calcium carbonate, as determined in a study performed according to OECD TG 105, is 16.6 mg/L at 20 °C. The solubility of calcium oxide was recalculated from the water solubility value of calcium, which was stated in the study report. Crumbles on exposure to moist air. The braid uised term "lime" connotes calcium-containin inorganic materials, that include carbonates, oxides an hydroxides o calcium, silicon, magnesium, aluminium, an airn predominate, lik limestone. bone, the study of the solubility of the calcium salts of bone was confined to CaC03 and Cas(PO&. Calcium oxide (CaO), commonly kent as quicklime or burnt lime, is a widely uised chemical compoond.It is a white, caustic, alkaline crystalline solit at ruim temperatur. The compound is strongly caustic. Commercial samples can be yellowish, but the pure compound is white. Ì.‘%'E*\\>z¿ùĶ­¥H¦y÷>–˘dP�Û�¸%* .Gß#*ÔR¶¯>m1£¿Cÿn+ñ �ª‡‡‡ Í÷O¤IPÈev�Âû»FcÂ'§ğ¹30ˆŸ…ÿj\"3«Áğ$ïaèá¿ù'A Water solubility Solubility in organic solvents / fat solubility Surface tension Flash point Auto flammability Flammability Explosiveness Oxidising properties Oxidation reduction potential Stability in organic solvents and identity of Bioaccumulation is not relevant for calcium oxide. The value for the water solubility of calcium oxide was recalculated from the solubility value of calcium, which was stated in the study report. Close Find out more on how we use cookies. Temperatures as high as 800 C have been reached with addition of water (moisture in air or soil). Calcium oxide (CaO), commonly known as quicklime or burnt lime, is a widely used chemical compound.It is a white, caustic, alkaline, crystalline solid at room temperature. It often appears with a yellowish or brownish tint to the presence of impurities, especially iron. Welcome to the ECHA website. The water solubility of calcium oxide was tested by measuring the concentration calcium ions in saturated solution. The temperature was ± 0.5 °C. The substances are listed in alphabetical order. Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The table below provides information on the variation of solubility of different substances (mostly inorganic compounds) in water with temperature, at one atmosphere pressure. Calcium Oxide is insoluble in water. Related terms: Magnesium Oxide; Aluminum Oxide; Hydrogen; Carbon Dioxide; Calcium Carbonate; Carbonation Units of solubility are given in grams per 100 millilitres of water (g/100 ml), unless shown otherwise. Chemical names Calcium oxide C.A.S. Reacts with water to form corrosive calcium hydroxide, with evolution of much heat. ¾Kv£1@/Tş5×ß`àè0†i1¸1¨+v ØS¶�­)¤Pë¾í¬. pH of the saturated solution: 12.3. The broadly used term "lime" connotes calcium-containing inorganic materials, in which carbonates, oxides and hydroxides of calcium, silicon, magnesium, aluminium, and iron predominate. Calcium oxide (KAL-see-um OK-side) is an odorless crystalline or powdery solid that, in a pure form, is white to off-gray. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). It is the peroxide (O22−) salt of Ca2+. Therefore the value was recalculated from the water solubility value of calcium as stated in the study report. However, calcium oxide can be converted to compounds of reduced solubility such as silicates, aluminates, or even hydrophosphates, which then can be used in an acid-base reaction with phosphate, forming CBPCs. EC number: 215-138-9 | CAS number: 1305-78-8. Water solubility of calcium oxide: soluble (study results, EU A.6 method). Calcium peroxide or calcium dioxide is the inorganic compound with the formula CaO2. It is standard textbook knowledge that calcium oxide reacts to calcium hydroxide in contact with water. The water solubility of calcium oxide was tested by measuring the concentration calcium ions in saturated solution. Calcium Oxide. 4) Particle size distribution (Granulometry), Solubility in organic solvents / fat solubility, Stability in organic solvents and identity of relevant degradation products, Storage stability and reactivity towards container material, Biodegradation in water and sediment: simulation tests, Additional information on environmental fate and behaviour, Short-term toxicity to aquatic invertebrates, Long-term toxicity to aquatic invertebrates, Toxicity to aquatic algae and cyanobacteria, Toxicity to aquatic plants other than algae, Endocrine disrupter testing in aquatic vertebrates – in vivo, Toxicity to soil macroorganisms except arthropods, Endocrine disrupter mammalian screening – in vivo (level 3), Direct observations: clinical cases, poisoning incidents and other, Exposure related observations in humans: other data, Additional physico-chemical properties of nanomaterials, Toxicokinetics, metabolism and distribution. 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